<!DOCTYPE html>
<html>

<head>
  <title>登录界面</title>
  <style>
    body {
      font-family: Arial, sans-serif;
      background-color: #f4f4f4;
    }

    form {
      width: 300px;
      margin: 0 auto;
      background-color: #fff;
      padding: 20px;
      border-radius: 5px;
      box-shadow: 0 0 10px rgba(0, 0, 0, 0.1), 0 5px 15px rgba(0, 0, 0, 0.3);
    }

    label {
      display: block;
      margin-bottom: 10px;
      font-weight: bold;
    }

    input[type="text"],
    input[type="password"] {
      width: 100%;
      padding: 10px;
      margin-bottom: 20px;
      border: 1px solid #ccc;
      border-radius: 3px;
      box-shadow: inset 0 1px 3px rgba(0, 0, 0, 0.1);
    }

    input[type="submit"] {
      width: 100%;
      padding: 10px;
      background-color: #4CAF50;
      color: #fff;
      border: none;
      border-radius: 3px;
      cursor: pointer;
      box-shadow: 0 2px 5px rgba(0, 0, 0, 0.3);
    }
  </style>
</head>

<body>
  <form action="">
    <label for="username">用户名：</label>
    <input type="text" id="username" name="username">
    <label for="password">密码：</label>
    <input type="password" id="password" name="password">
    <input type="submit" value="登录">
  </form>
</body>

</html>